tests: Remove various unneeded coverage workarounds

Tests now run from root dir so various coverage complications
can be removed.

Also remove the duplicate .coveragerc and rely on pyproject.toml

Signed-off-by: Jussi Kukkonen <jkukkonen@google.com>

.github/workflows/_test.yml

@@ -74,14 +74,8 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COVERALLS_FLAG_NAME: ${{ runner.os }} / Python ${{ matrix.python-version }}
           COVERALLS_PARALLEL: true
-        # Use cp workaround to publish coverage reports with relative paths
-        # FIXME: Consider refactoring the tests to not require the test
-        # aggregation script being invoked from the `tests` directory, so
-        # that `.coverage` is written to and .coveragrc can also reside in
-        # the project root directory as is the convention.
         run: |
-          cp tests/.coverage .
-          coveralls --service=github --rcfile=tests/.coveragerc
+          coveralls --service=github
 
   coveralls-fin:
     # Always run when all 'tests' jobs have finished even if they failed

pyproject.toml

@@ -153,4 +153,8 @@ exclude_also = [
     "raise AssertionError",
     # imports for mypy only
     "if TYPE_CHECKING",
+]
+[tool.coverage.run]
+omit = [
+    "tests/*",
 ]

tests/.coveragerc

@@ -1,13 +0,0 @@
-[run]
-branch = True
-
-omit =
-    */tests/*
-    */site-packages/*
-
-[report]
-exclude_lines =
-    pragma: no cover
-    def __str__
-    if __name__ == .__main__.:
-    @abstractmethod

tox.ini

@@ -12,7 +12,7 @@ skipsdist = true
 commands =
     python3 --version
     python3 -m coverage run -m unittest
-    python3 -m coverage report --rcfile {toxinidir}/pyproject.toml -m --fail-under 97
+    python3 -m coverage report -m --fail-under 97
 
 deps =
     -r{toxinidir}/requirements/test.txt
@@ -33,10 +33,9 @@ commands_pre =
 
 commands =
     python3 -m coverage run -m unittest
-    python3 -m coverage report  --rcfile {toxinidir}/pyproject.toml -m
+    python3 -m coverage report -m
 
 [testenv:lint]
-changedir = {toxinidir}
 deps =
     -r{toxinidir}/requirements/lint.txt
     --editable {toxinidir}
@@ -49,7 +48,6 @@ commands =
     mypy {[testenv:lint]lint_dirs}
 
 [testenv:fix]
-changedir = {toxinidir}
 deps = {[testenv:lint]deps}
 commands =
     ruff check --fix {[testenv:lint]lint_dirs}
@@ -59,6 +57,5 @@ commands =
 deps =
     -r{toxinidir}/requirements/docs.txt
 
-changedir = {toxinidir}
 commands =
     sphinx-build -b html docs docs/build/html -W